<complexType name="PolygonType">
<annotation>
<documentation>A Polygon is a special surface that is defined by a single surface patch. The boundary of this patch is coplanar and the polygon uses planar interpolation in its interior. It is backwards compatible with the Polygon of GML 2, GM_Polygon of ISO 19107 is implemented by PolygonPatch.</documentation>
</annotation>
<complexContent>
<extension base="gml:AbstractSurfaceType">
<sequence>
<element minOccurs="0" ref="gml:exterior"/>
<element maxOccurs="unbounded" minOccurs="0" ref="gml:interior"/>
</sequence>
</extension>
</complexContent>
</complexType>